---
title: "CVE-2024-7589\n    | Ubuntu"
description: Ubuntu is an open source software operating system that runs from the
  desktop, to the cloud, to all your internet connected things.
url: https://ubuntu.com/security/CVE-2024-7589?format=md
keywords: index, follow
---

# CVE-2024-7589

Publication date 12 August 2024

Last updated 1 August 2025

---

Ubuntu priority

**Medium**

[Why this priority?](https://ubuntu.com/security/cves/about#priority )

## Cvss 3 Severity Score

**8.1 · High**

[Score breakdown](https://ubuntu.com/security/CVE-2024-7589?format=md#impact-score)

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## Description

A signal handler in sshd(8) may call a logging function that is not
async-signal-safe. The signal handler is invoked when a client does not
authenticate within the LoginGraceTime seconds (120 by default). This
signal handler executes in the context of the sshd(8)'s privileged code,
which is not sandboxed and runs with full root privileges.
This issue is another instance of the problem in CVE-2024-6387 addressed by
FreeBSD-SA-24:04.openssh. The faulty code in this case is from the
integration of blacklistd in OpenSSH in FreeBSD.
As a result of calling functions that are not async-signal-safe in the
privileged sshd(8) context, a race condition exists that a determined
attacker may be able to exploit to allow an unauthenticated remote code
execution as root.

[Read the notes from the security team](https://ubuntu.com/security/CVE-2024-7589?format=md#notes)

## Status

Show unmaintained releases

| Package | Ubuntu Release | Status |
| --- | --- | --- |
| openssh | 24.04 LTS noble | Not affected |
| 22.04 LTS jammy | Not affected |
| 20.04 LTS focal | Not affected |
| 18.04 LTS bionic | Not affected |
| 16.04 LTS xenial | Not affected |
| 14.04 LTS trusty | Not affected |
| openssh-ssh1 | 24.04 LTS noble | Not affected |
| 22.04 LTS jammy | Not affected |
| 20.04 LTS focal | Not affected |
| 18.04 LTS bionic | Not affected |

---

* [How can I get the fixes?](https://ubuntu.com/security/cves/about#security)
* [What do statuses mean?](https://ubuntu.com/security/cves/about#statuses)

## Notes

---

### [seth-arnold](https://launchpad.net/~seth-arnold)

openssh-ssh1 is provided for compatibility with old devices
that
cannot be upgraded to modern protocols. Thus we may not
provide security
support for this package if doing so would prevent access to
equipment.

---

### [alexmurray](https://launchpad.net/~alexmurray)

Only affects OpenSSH on FreeBSD so Ubuntu is not affected.

## Severity score breakdown

CVSS version:
CVSS v3.0

**Base score**

8.1 · High

* Base metrics

  | Parameter | Value |
  | --- | --- |
  | Attack vector | Network |
  | Attack complexity | High |
  | Privileges required | None |
  | User interaction | None |
  | Scope | Unchanged |
  | Confidentiality impact | High |
  | Integrity impact | High |
  | Availability impact | High |
* Scores

  | Parameter | Value |
  | --- | --- |
  | Base score | 8.1 · High |
  | Exploitability score | - |
  | Impact score | - |

**Vector:** CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

## References

* [MITRE](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2024-7589)
* [NVD](https://nvd.nist.gov/vuln/detail/CVE-2024-7589)
* [Launchpad](https://launchpad.net/bugs/cve/CVE-2024-7589)
* [Debian](https://security-tracker.debian.org/tracker/CVE-2024-7589)

### Other references

* <https://www.cve.org/CVERecord?id=CVE-2024-7589>